Marvel Mystery Oil ??

Walter Rego said:
I had a car a few years ago with a well known issue of the gas gauge not reading full even if you filled it to overflowing. Which is not a good thing.

A dose of MMO would solve the issue, for several fill ups anyway. Apparently the float or sensor that measured the fuel level would get sticky and the solvent or lubrication properties of the MMO would free it up. And before you blame the fuel, all I ever used in that car was 91 octane top tier fuel. So MMO does definitely have some beneficial applications.

I use Stabil in the fuel for my snowblower, I also only use top tier fuel in it and at the end of the season I add an ounce to the gas tank and then run it dry. I figure the MMO helps clean the carb jets and float. It is inexpensive and works but isn't a panacea for serious mechanical issues. It's just a mild solvent and lube.
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I had an old locking gas cap that I inherited from my Uncle. Probably dated to the 1940's. When the gas crisis of 1973 happened I put it on my wife's car because she parked in a lot at her workplace with no security. Apparently, the seal was shut solid. Good fuel pump on that old Ford. When the car finally quit it had sucked the tank into a concave mess. It would only hold about 5 gal. Had to fillerup every day.....LOL.

Dad used to swear by draining the tanks for Winter so I did the same. Then several times I had carb problems in the Spring. The last 25+ years of leaving my engines full of stabilized fuel has shown no problems at all.

All the hullabaloo about alcohol gas is due to moisture in the tank. A little bit and the alcohol fixes it. A LOT and you would have trouble with even E0. The secret is a full tank and dry indoor storage.
 
I worked for my Uncle on his ranch back in the 50s. He bought MMO by the gallon and used it in everything. I only used it once in a 66 Pontiac 421 with sticking lifters. After a quart in the gas my problem went away and never came back. Never saw the need for regular use as long as every thing was working.
 
I studied fuels and lubricants in my undergraduate studies. I also designed and developed modern spark ignition engines. In my opinion, there is no such thing as a mechanic in a can or bottle. It is true that gasoline oxidizes and becomes “sour”, especially in the presence of yellow metal. Stabil inhibits this aging process and increases the shelf life of gasoline. Another factor is the corrosive effects of alcohol in gasoline. Considerable engineering went into the design of fuel delivery and metering systems to allay these concerns. In simple terms, manufacturers design, develop, and rigorously test to ensure 120,000 miles/7years of emissions compliance. After that period, it’s anyone’s guess what will happen. Disclaimer: I’ve been retired for ~ 20 years!

PS - exhaust gas oxygen sensors don’t like chemicals like silicon. They get poisoned and drive the calibration very lean. I’d be careful with what I put in the gas tank.
 
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Do NOT use it in diesel fuel! Since sulfur was removed from diesel fuel there is less lubricity and I can tell you from personal experience that with a Bosch VP44 injection pump that is used in a 2002 dodge ram with the 5.9 cummins, MMO is NOT a lubricant, it is a solvent! I have however used it on gasoline engines with great results.
 
I have a long history with Marvel Mystery Oil . I used to buy it in 5 gal cans . I had tractors , front end loaders and a dozer . It kept my motors cooler working in the hot sun in southern Az . Without they ran much hotter .
My fiance's 06 Chrysler Town and Country at about 150K miles starting using oil , a lot of oil between oil changes . After a couple of tanks of gas mixed with MMO , the oil comsumption between oil changes dropped to zero . I use it to clean my firearms . Yes , I MMO stands well with me . Regards Paul
 
Speaking of motorcycles , I have in the past rebuilt antique Harley's . After rebuilding the engines and transmissions , MMO was a " god send " . The transmissions shifted sooooo much smoother just adding a couple of ounces of MMO . Added to the fuel , it kept them clean and running cooler . Remember I'm talking about southern Az in the summer time . Regards Paul
 
GypsmJim said:
I collect old outboard motors. Seventy Three are hanging on the walls in my museum (the wife's terminology) as of this writing. I run E10 in everything. Fantastic stuff....keeps the internals clean. A little Stabil in the Fall in a full tank of gas. Nothing else.

My Classic Lyman sports a 1953 Evinrude Big Twin. The fuel lines have been replaced with alcohol compatible ones, and the lacquered cork float in the gas tank was replaced with a neoprene rubber stopper. Fresh water usage, so I can get 8-10 years on a water pump impeller.


I shoulda been a snakeoil salesman.....coulda made a lota money.
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Nice collection.
I have a old blue & yellow, 5hp , Good Year in my garage, that my father used back in the 60's.

Memories.
 
While I no longer use MMO in our cars and trucks, I still use it around the house and workshop as a general lubrication and gunk remover. I LOVE the smell! Although I have never used it on guns I don't see any reason why it could not be used. It is sort of a CLP.

I still have an original metal quart container that I pour new stuff into. Never liked the plastic - lol. I also have two old oilers that are filled with the MMO for handy use.
 

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grover99 said:
I worked for my Uncle on his ranch back in the 50s. He bought MMO by the gallon and used it in everything. I only used it once in a 66 Pontiac 421 with sticking lifters. After a quart in the gas my problem went away and never came back. Never saw the need for regular use as long as every thing was working.
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Me and a buddy bought a '52 Buick Special for parts. I drove it home, but it had noisy lifters. My dad, who worked on straight eight Buicks for years, looked it over. It was missing the oil filter housing. I had an extra one and we put it on the engine. Then my dad had me buy a quart of MMO. We put that in the engine, cranked it up and after a few minutes, the "ticking" went away.
 
All that Mystery Oil type stuff may have worked well in old carbureted engines. But new car engines with all the sensors and computer controlled fuel injection, not so much.

Just buy good gas.
 
I know folks who swore by using Marvels. Others who love Seafoam. I used Lucas in my diesel rig and had a noticeable increase in fuel mileage. '14 F350 with a 6.8 (loved that engine!).
 
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